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115 lines
2.7 KiB
JavaScript
115 lines
2.7 KiB
JavaScript
6 years ago
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"use strict";
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const __hasOwnProperty = Object.prototype.hasOwnProperty;
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const __slice = Array.prototype.slice;
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const objects = {
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// Produce's a shallow clone of the given object.
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clone( source ) {
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const target = {};
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for ( const key in source ) {
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if ( ! __hasOwnProperty.call( source, key ) ) continue;
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target[ key ] = source[ key ];
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}
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return target;
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},
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// Will loop through an object's properties calling the given function.
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//
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// NOTE:
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// This method is just a simplification of:
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//
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// Object.keys( object ).forEach( key => value = object[ key ] )`
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//
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// It is not meant to be compatible with `Array#forEach`.
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each( object, iterator ) {
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for ( const key in object ) {
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if ( ! __hasOwnProperty.call( object, key ) ) continue;
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iterator( object[ key ], key );
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}
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},
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// This method add's properties from the source object to the target object,
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// but only if they don't already exist. It is more similar to how a native
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// class is extened then the native `Object.assign`.
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extend( target, source ) {
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for ( const key in source ) {
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if ( ! __hasOwnProperty.call( source, key ) ) continue;
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if ( __hasOwnProperty.call( target, key ) ) continue;
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target[ key ] = source[ key ];
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}
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return target;
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},
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// Is similar to `Array#map`, but, just like `each`, it is not compatible,
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// especially because it returns an object rather then an array.
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map( object, transformer ) {
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const target = {};
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for ( const key in object ) {
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if ( ! __hasOwnProperty.call( object, key ) ) continue;
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target[ key ] = transformer( object[ key ], key );
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}
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return target;
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},
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// This return's an array like `Array#map` does, but the transformer method
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// is optional, so at the same time behave's like ES2015's `Object.values`.
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values( object, transformer ) {
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const target = [];
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let index = -1;
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let key, value;
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for ( key in object ) {
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if ( ! __hasOwnProperty.call( object, key ) ) continue;
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value = object[ key ];
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target[ ++index ] = transformer
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? transformer( value, key )
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: value;
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}
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return target;
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},
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// Will return a function that can be used to visit a specific property
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// no matter what object is passed to it.
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createVisitor( property, visit ) {
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return function visitProperty( object ) {
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visit( object[ property ], __slice.call( arguments, 1 ) );
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};
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},
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};
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module.exports = objects;
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